Hello Xing, > Do you have a libvirt volume driver on the Nova side for DRBD? No, we don't. We'd just use the existing DRBD 9 kernel module to provide the local block devices.
> Regarding getting consistency group information to the Nova nodes, can > you help me understand the steps you need to go through? > > 1. Create a consistency group > 2. Create a volume and add volume to the group > Repeat the above step until all volumes are created and added to the > group > 3. Attach volume in the group > 4. Create a snapshot of the consistency group The question I'm asking right now isn't about snapshots. > Do you "setup" the volume on the Nova side at step 3? We currently don't > have a group level API that "setup" all volumes in a group. Is it > possible for you to detect whether a volume is in a group or not when > attaching one volume and "setup" all volumes in the same group? Well, our Cinder driver passes some information to the Nova nodes; within that information block we can pass the consistency group (which will be the DRBD resource name) as well, to detect that case. > Otherwise, it sounds like we need to add a group level API for this > purpose. Perhaps just adding a "volume is in consistency group X" data item would be enough, too? Sorry about being so vague; I'm just not familiar enough with all the interdependencies from Cinder to Nova. Regards, Phil -- : Ing. Philipp Marek : LINBIT | Your Way to High Availability : DRBD/HA support and consulting http://www.linbit.com : DRBD® and LINBIT® are registered trademarks of LINBIT, Austria. _______________________________________________ OpenStack-dev mailing list OpenStackfirstname.lastname@example.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev